CVE-2026-105244

Description

Improper Encoding or Escaping of Output vulnerability in the RemoteSyslogAppender of Apache log4net. Every character outside visible ASCII and space was removed from the record instead of being escaped, so non-ASCII text and control characters such as tabs disappeared without notice. A party whose data reaches a log message could make a distinct value look identical in the record, for example a user name holding a zero-width space logged as admin. Only applications that use RemoteSyslogAppender are affected. This issue affects Apache log4net: from 1.2.12 before 3.5.0. Users are recommended to upgrade to version 3.5.0, which fixes the issue.

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Produits concernés

• Apache Software Foundation Apache log4net
• Apache log4net

Scores CVSS

Faiblesses (CWE)

• CWE-116

Références

• https://github.com/apache/logging-log4net/commit/77717061b20d4346b6c0ce6b54643d85fb348bc7 Patch
• https://github.com/apache/logging-log4net/pull/315 PatchVendor Advisory
• https://lists.apache.org/thread.html/q7649hhdodthoqw8jsjgtnb4m8qfy6d6 Mailing ListVendor Advisory
• http://www.openwall.com/lists/oss-security/2026/10/07/19 Mailing ListThird Party Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories